How does require work with new operator in node.js?

by

These two versions are fundamentally different.

This one:

new (require('./file')).func('r1');

Executes the require, returning the exports of ./file and then calling the new operator on the results .

This one:

var r2 = new require('./file').func('r2');

Invokes require as a constructor.

Let’s look at a more isolated and simple example:

new Date() // creates a new date object
new (Date()) // throws a TypeError: string is not a function

More Related Contents:

  1. How to deal with cyclic dependencies in Node.js
  2. The difference between “require(x)” and “import x”
  3. How to make node.js require absolute? (instead of relative)
  4. How to remove module after “require” in node.js?
  5. What is the difference between require(‘mypackage.js’) and require(‘mypackage’)?
  6. Detect if called through require or directly by command line
  7. How can I make Node.js ‘require’ absolute? (instead of relative)
  8. Why is Node.js single threaded? [closed]
  9. How to access the GET parameters after “?” in Express?
  10. How can I make multiple projects share node_modules directory?
  11. Angular 6 many Can’t resolve errors (crypto, fs, http, https, net, path, stream, tls, zlib)
  12. RabbitMQ / AMQP: single queue, multiple consumers for same message?
  13. Install dependencies globally and locally using package.json
  14. How to implement a secure REST API with node.js
  15. Do you need to use path.join in node.js?
  16. Fill missing dates in records
  17. Node.js with Express: how to redirect a POST request
  18. MongoDB connection error: MongoTimeoutError: Server selection timed out after 30000 ms
  19. Node package ( Grunt ) installed but not available
  20. Error: EACCES: permission denied
  21. How to drop a database with Mongoose?
  22. Hooking up express.js with Angular CLI in dev environment
  23. npx command not found
  24. Lazy loading in node.js
  25. What does -save-dev mean in npm install grunt –save-dev
  26. Observe file changes with node.js
  27. npm: Why is a version “0.1” invalid?
  28. How to catch an ENOENT with nodejs child_process.spawn?
  29. What’s the difference between dependencies, devDependencies, and peerDependencies in NPM package.json file?
  30. How to limit upload file size in express.js

Leave a Comment